Uhhhh---yeahhhhhh....This has been making the rounds since 2001! Gary Trudeau fell for it. I don't know why, after all these years, people still fall for garbage that is passed along on the internet. Every time I get forwarded stuff like this, even when it is unflattering to liberals, I go to snopes. It should be a rule. Though shalt check snopes.com before passing it along!
Because they want to believe it, no matter how ridiculous it sounds. The left has invested everything they have into the notion that George W. Bush is a complete moron, so any time something comes along that "proves" it, they snap at it like a marlin at a squid.